# All files / src/chap05 HeavyUI.js

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     function sleep(delay) {
      let start = Date.now();
      while (Date.now() - start < delay);
    }

    // delay 밀리초 지연 발생
    export default function HeavyUI({ delay }) {
      sleep(delay);
      return <p>지연 시간은 {delay}밀리초</p>;
    }